Staybolt structure



STAYBOLT STRUCTURE.

LLLLLLLLLLLLLLLLLLLLLLLLLLLL UNITED STATES PATENT OFFICE.

JOHN ROGERS FLANNERY, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO FLAN- NERY BOLT COMPANY, OF PITTSBURGH, PENNSYLVANIA.

STAYBOLT STRUCTURE.

Application filed July 29, 1918.

T 0 all whomit may concerns Be it known that I, J OHN ROGERS FLAN- NERY, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Staybolt Structures; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in staybolt structures.

In stay bolt structures wherein the head of the bolt is flexibly mounted in a seat formed in the outer sheet of a boiler, and is covered by a cap welded to said outer sheet, it is essential that the cap be properly located and centered with relation to the bolt opening in the boiler sheet, so as to provide for proper and equal clearance around the bolt head. It is difficult to properly space the cap when the head of the bolt and the opening are concealed by the cap, and heretofore it has been the practice to counter- .bore a shallow groove around the bolt opening to receive the free edge of the cap, the recessed seat thus formed operating to properly locate the cap and hold it against lateral displacement during the welding operation. This method is however expensive and the object of my invention is to lessen the expense of assembling the parts which I accomplish by the use of a ring on the bolt head which acts as a spacing member for the cap and which operates to guide the cap into its proper and natural position with relation to the bolt head and hold it in such position during the welding operation.

The accompanying drawing illustrating my invention, is a view in transverse section through a section of a boiler sheet and stay bolt cap, the stay bolt being in elevation.

1 represents the outer sheet of a boiler provided with a bolt hole 2, the upper portion of the latter being curved to form a concave seat 5 for the head 3 of the stay bolt 4. The head 3 of the bolt is flexibly mounted on the curved seat 5. and the portion of the hole 2 at the inner surface of the sheet 1 is sufliciently large to permit of all necessary movement of the stay bolt due to the Specification of Letters Patent.

Patented Oct. 5, 1920.

Serial no, 314,085.

unequal expansion and contraction of the outer and inner sheets to which the bolt is rigidly secured in the usual and well known manner.

6 is a spacing member made of any suitable material and shaped to snugly fit the portion of the head 3 of the bolt 4 projecting beyond the outer surface of boiler sheet 1. This spacing member may be a ring adapted to be dropped over the head of the bolt, or a lining fitting snugly within the cap so that when the cap is placed over the head of the bolt it will center the cap properly over the bolt head, after which the cap is welded at 7 to the outer sheet.

The spacing member is made of any suitable material but I prefer a destructible material soluble in water or steam, or which will be softened and disintegrated by water or steam, or by the latter and the grinding action to which it will be subjected by the head of the bolt when the sheets are heated and under the pressure of the steam in the boiler. It performs no function after the cap has been secured in place on the outer sheet, hence any material that will not interfere with the free movement of the bolt head, and preferably a material that will be dissolved or dissipated under thedaction of the water or steam, may be use It is evident that many slight changes might be resorted to in the relative arrangement of parts shown and described without departing from the spirit and scope of my invention. Hence I would have it understood that I do not wish to confine myself to the arrangement or construction of parts shown and described but,

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. In a stay bolt structure, the combination of an outer sheet having a hole for the passage of bolt and a seat for the head of the bolt, a cap for covering the bolt head and a spacing member between the bolt head and cap for centering the latter with relation to the bolt prior to securing the cap to the outer sheet.

2. In a stay bolt structure, the combination of an outer sheet having a hole for the passage of a bolt and a seat for the head of a bolt, a cap adapted to be secured to the outer sheet and cover the bolt head and a spacing member between the bolt head and cap for centering the latter relative to the bolt prior to securing the cap to the outer sheet, the saidspacing member adapted to be destroyed by the action of steam or Water thereon.

3. In a staybolt structure, the combination of an outer sheet having a hole for the passage of a bolt and a seat for the head of a bolt, a cap for covering the bolt head,

and a; spacing member independent of the cap and 'bolt head, the said spacing memher being between the bolt head and cap for centering the latter with relation to the bolt head prior to securing the 'cap to the outer sheet.

In testimony whereof, I have signed this specification in the presence of tWo subscribing Witnesses.

JOHN ROGERS FLANNERY.

lVitnesses b. H. ALLIsoN, JAMES R.'}IORAN. 

